post-tensioningin buildings

CCL Post-tensioning Systems provide a method of strengthening concrete by exploiting its strength in compression and overcoming its weakness in resisting tension.

Using high strength steel strand and specialized anchorage assemblies a compressive force is applied to the concrete when the strands are stressed. CCL XF, XU, and XM Post-tensioning Systems are ETA approved.

POST-TENSIONEDBEAMS

For applications requiring longer spans and greater load capacity, post-tensioned beams may be used. They are also suitable for applications where enhanced crack resistance is required.

Post-tensioned beams are often required in transfer structures in order to control deflections via staged stressing.

They can achieve longer spans than pre-tensioned beams. The tendons can be profiled to balance dead load and control deflection at mid-span. Post-tensioned beams are often installed in conjunction with post-tensioned slabs.

VERTICAL POST-TENSIONING IN BUILDING STRUCTURES

Vertical post-tensioning is used to stabilize the core of a building. This has the benefit of reducing the use of stabilizing walls to create a more flexible layout. It absorbs horizontal loads and is based on the same concept as horizontal post-tensioning.

Used in buildings with more than three storeys incorporating precast slabs, it is typically found in elevators and staircases with the bars located in the bottom of the construction. The bars are thereafter rooted in the foundation and stressed despite there being access to only one end of the bars. Advantages of vertical post-tensioning include:

Flexible layout because of fewer supporting walls

Increased rigidity and fewer cracks

Complete re-cast of strands because of grouting from bottom to top

A stable form of construction with accurately measured tendon forces

Bridges

In association with sister company CCL Scandinavia, CCL Norway provides services for bridges. These include the post-tensioning of bridges to create longer spans, reduce the quantities of mild reinforcement to lower costs and provide enhanced crack resistance.

This is complemented by the supply and installation of bridge bearings and expansion joints for both new and existing structures.

Engineering

As well as offering a complete post-tensioning package of design, supply and installation, CCL Norway also provides specialized post-tensioning engineering services for engineers and contractors. The company uses the latest tested and approved techniques and technologies to help clients achieve their optimal solution.

CCL Norway is part of the international CCL group of companies, which has a wealth of experience and expertise gained from hundreds of projects undertaken throughout the world. CCL Norway can draw on the resources of CCL to ensure it provides imaginative, economic solutions specifically tailored to meet clients’ requirements.

external post-tensioningand rehabilitation

Change of use or revised loadings can call for modifications to post-tensioned slabs. CCL Norway is able to create additional voids or provide strengthening measures to accommodate these changes.

The company carries out strengthening and rehabilitation of structures, concrete beams and slabs using external post-tensioning. The same process can also be used to provide increased capacity. When deflection is an issue CCL Norway will use external post-tensioning to create upward forces to control the deflection. External strands are also used when an increase to the axial load on a structure is required. Broken or damaged strands require remedial action. External post-tensioning can be installed to rehabilitate the structure.